298 GRIFFITHS: West AMERICAN FUNGI 
Ariz., Nov. 1900. Apparently not a common species. This in 
probably the other stage of Aecideum bouvardiae D. & H. As- 
sociated with it on the same leaves are the remains of a few old 
aecidia whose spores correspond very well with that species. The 
aecidial stage is altogether too old however for one to decide with 
certainty. 
Puccinia Burnettii sp. nov. 
Persistently epiphyllous, with very large, scattered, conspic- 
uous sori which often attain a length of 2 cm. and a width equal to 
that of the leaf, usually causing the edges of the leaf to recurve so as 
to leave the sorus convex ; leaf brown below, the ruptured epidermis 
prominent but not merely cracking open in the center as usual but 
being pushed off in large shreds as long as the sorus and often 1-2 
mm. in breadth; uredospores subglobose to elliptical or ovate, 
20-26 # in diameter, epispore thick, visibly and evenly tubercu- 
late ; teleutospores very uniform, 
elliptical, very slightly if at all 
~ wider above than below, rounde 
above and below, slightly com 
stricted at the septum, 18-23 
x 28-31 p, epispore rather thick, 
sparsely clothed with short hya- 
line fugacious projections, ve Y 
slightly if at all thickened above ; 
pedicel hyaline, 2-4 times t® 
length of the spore. (Fig. 7.) 
On Stipa comata T. & R. 
(387), on the Burnett ranch ned 
Buffalo, Wyo., Aug. 1898 (Wil- 
liams & Griffiths). Latet the 
same season it was collected at 
Se the same 
Fic. 7. Uredospores and teleutospore Billings, Montana, on Burnett 
of Puccinia Burnettit. >< 315. host. Named for Mr. DU 
of Puccinia micrantha. < 315. 
this rust. : 
The species is remarkable for its persistently epiphyllous eco 
acter and large sori. Even when occurring on the sheatse 
it does very rarely, the sori rupture on the inside and its pone 
is distinguishable by a slight distortion and purplish of brown's 
coloration on the outside as on the leaf. 
